[horde] automatically add to address book

[Frank Zhang]

Hi:
  I saw some site is doing this:
  When you open an email message, there is a address book icon sitting
beside an email address, then you click that icon so the email address will be automatically added into your
personal address book, how to implement this feature ?
 Normally you have to fill up the form to add somebody into your personal
email addressbook.
 Thanks
 Frank Zhang